Caravan serpentine belt

It's my 94 Caravan, 180K. Its serpentine belt would come off in any rainy
days, even roads are just a little wet. I have got the belt re-installed

many times in a garage. The mechanic has replaced the tensioner and belt
with new ones a year ago, but it still happens again and again. Now I think
it's possible the garage has never done it right. Maybe I should get the van
to dealer for a permanent fix? Or I have to live with it?
Thanks,
John

I know someone who had a 91 Caravan with 3.3 v6...they continued having
problems with the belt coming off after the original tensioner gave out.
Replaced it several more times, they ended up putting in a Chrysler part and
the problem went away.
Wesley

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